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Communicable diseases

7 lessons in Infection and response.

40 exam questions · 88 marks

3.1 Pathogens and how diseases spread What pathogens are (bacteria, viruses, fungi and protists), how each makes us ill, how communicable diseases spread by air, water, direct contact and vectors, and how their spread can be reduced. AQA Edexcel OCR 3.2 Viral diseases: measles, HIV and TMV AQA: the three viral diseases to know. Measles (droplets, fever and rash), HIV (body fluids, damages the immune system, leading to AIDS) and tobacco mosaic virus (mosaic leaves that reduce photosynthesis), with how each spreads and is controlled. AQA 3.3 Bacterial, fungal and protist diseases AQA: salmonella and gonorrhoea (bacteria), rose black spot (a fungus) and malaria (a protist carried by mosquitoes): symptoms, how each spreads and how the spread is controlled. AQA 3.4 Common infections: cholera, TB, Chalara, malaria and HIV Edexcel: the five common infections to know (cholera, tuberculosis, Chalara ash dieback, malaria and HIV), the pathogen that causes each, its effects, how it spreads and how the spread can be reduced or prevented. Edexcel 3.5 Helicobacter, Ebola and the virus life cycle Edexcel Biology only: stomach ulcers caused by Helicobacter bacteria, Ebola haemorrhagic fever spread in body fluids, and the lytic and lysogenic pathways by which viruses reproduce in host cells. Separate only Edexcel 3.6 Sexually transmitted infections Edexcel: how the sexually transmitted infections chlamydia (a bacterium) and HIV (a virus) spread, and how their spread can be reduced or prevented with condoms, screening, needle exchanges, blood screening and treatment. Edexcel 3.7 Human and plant infections OCR: examples of communicable diseases caused by viruses, bacteria, fungi and protists in humans and plants (HIV/AIDS, TB, athlete's foot, malaria, TMV, Agrobacterium, barley powdery mildew), STIs, and how diseases such as HIV and TB, or HPV and cervical cancer, interact. OCR